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发表于 2016-12-22 19:35:52
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8. Before taking a plane at the airport, all passengers ________ go through safety check.
A) can B) must C) may D) ought to
9. — Must I put on my coat, Mum?
— Yes, you _______. It’s freezing outside.
A) may B) can C) must D) need
10. Some people ________ feel sick when they read a book in a car or on a boat.
A) can B) may C) must D) ought
11. Students ________ be careful when they do chemical experiments in the lab.
A) can B) must C) need D) may
12. It’s proved that we ________ improve our memory by using various memorizing methods.
A) can B) must C) should D) need
13. Even a small portable computer ______ store huge amounts of information.
A) can B) may C) must D) should
14. – Must I finish the task in a week?
– No, you ______. If you have any problem, please tell me.
A) can’t B) mustn’t C) may not D) needn’t
15. In order to keep safe, we ________ keep away from crowded places.
A) may B) can C) need D) should
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